Mineral oil lubricant



Patented @ct. 31, 1939 UNHTEE STATES MINERAL 01L LUBRICANT John M. Musselman, Cleveland, Ohio, assignor to The Standard i! Company, Cleveland, Ohio, a corporation of Ohio No Drawing. Application October 14, 193?, Serial No. 169,050

3 Claims.

This invention relates. to mineral lubricating oils, and more particularly oils which are subject to high temperature exposure in'usage; and it is among the objects of the invention to provide an oil whichis resistant against degradation changes, and of excellent properties otherwise.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described, and particum larly pointed out in the claims, the following de-' scription setting forth in detail certain illustrative embodiments of the invention, these being indicative however, of but a few of the various ways in which the principle of the invention may 15 be employed.

It has been known for some time that mineral oils to which small amounts of certain agents have been added, resist oxidation more efiectively in usage. I have found however, that where oils are subjected to high temperature exposure in usage, as for instance in internal combustion engine crank cases, the factors making for degradation of the oil are not so simple, but involve complex action,including apparent polymerization 25 and molecular change, and in such usage I have found certain compositions which are especially durable and advantageous in drastic usage. In accordance with my present invention, the oil is a mineral oil of greater or less viscosity, as desired,

30 oils for instance from viscosity of 47 sec. S. U. at 210 F. to 190 sec. SJU. at 210 F., and with the oil is incorporated an aromatic nitroso compound such as o-nitroso-m-cresol, nitroso-phenol, ni-

troso-benzol, nitroso-naphthol, nitroso-xylenols, individual or mixed, nitrosodiethylaniline. The proportion of such compound is relatively small and ranges fromTLOOl to 'per cent, but ordinarily amounts of less than 1 per cent are ample.

As an example: 0.1 per cent of o-nitroso-mcresol is incorporated in the lubricating oil of 53 sec. viscosity at 210 F., being thoroughly mixed.

The other materials may be similarly compounded.

Th is application is a continuation, in part and as to common subject matter of my application Sen-No. 752,534, filed Nov. 10, 1934.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided however, the features stated in any'of the following claims, or the equivalent of such, be employed.

I therefore particularly point out and distinctly claim as my invention:

1. A lubricant, comprising a mineral oil oi. lubricating viscosity and a small amount of a compound of the general formula CsR.NO, in which R is H5 or HsCHaOI-I or H2 (CH3) H.

2. A lubricant resistant to degradation change upon exposure to .high temperatures, comprising a mineral oil of lubricating viscosity and a small amount of o-nitroso-m-cresol.

3. A lubricant resistant to degradation change upon exposure to high temperatures, comprising a 3 mineral oil of lubricating viscosity and a small amount of nitroso-benzol.

JOHN MUSSEIMAN. 

